Vin Diesel Remembers 'Fast & Furious' Co-Star and Friend Paul Walker

Paul Walker's "Fast and the Furious" co-star Vin Diesel made a public tribute to his longtime friend at the site of the car crash that killed Walker over the weekend. Yesterday, as fans were holding vigil at the location where Walker died, Diesel addressed them on a loudspeaker from a nearby police car. Reporter Gadi Schwartz recorded Diesel's short speech on Instagram, which you can watch below.

An emotional Diesel told the crowd, "I just wanted to say thank you. Thank you for coming down here and showing that angel up in heaven how much you appreciate him."

As investigators continue to piece together exactly what caused the Porsche Carrera GT Walker was in to crash and burst into flames, one witness tells The Hollywood Reporter that Walker and his friend Roger Rodas took the high-end vehicle for a spin because "something was wrong" with it.

"As they were backing up the Carrera to put into the garage, it started stalling," the witness explains to THR. "I heard someone say, and I think it was Roger [who reportedly was driving], 'Why is the car stalling? Let's take it around the block.' Paul said, 'Let me go with you really quickly.'"

The accident occurred soon after, killing both men.

Meanwhile, the L.A. Sheriff's Department has confirmed that, contrary to some initial reports, there was no drag racing involved in the fatal crash.